Question:medium
Define : Molecularity of reaction
Define : Molecularity of reaction
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Never confuse Molecularity with Order. Molecularity is theoretical and only for elementary steps, while Order is experimental and applies to the overall reaction.
Updated On: Feb 19, 2026
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Solution and Explanation
Step 1: Understanding the Concept:
Molecularity is a theoretical concept applicable only to elementary (single-step) reactions.
Step 3: Detailed Explanation:
Molecularity is the number of reacting species (atoms, ions, or molecules) that must collide simultaneously to bring about a chemical reaction.
It can be unimolecular (1), bimolecular (2), or trimolecular (3).
Molecularity is always a whole number and cannot be zero, negative, or fractional.
Step 4: Final Answer:
Molecularity is the number of species colliding in an elementary step.
Molecularity is a theoretical concept applicable only to elementary (single-step) reactions.
Step 3: Detailed Explanation:
Molecularity is the number of reacting species (atoms, ions, or molecules) that must collide simultaneously to bring about a chemical reaction.
It can be unimolecular (1), bimolecular (2), or trimolecular (3).
Molecularity is always a whole number and cannot be zero, negative, or fractional.
Step 4: Final Answer:
Molecularity is the number of species colliding in an elementary step.
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